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Example 1: Completing the square

U10_L1_T2_we1 Completing the Square 1

Pythagorean theorem proof using similarity

Proof of the Pythagorean Theorem using similarity

Another Pythagorean theorem proof

Visually proving the Pythagorean Theorem

Why we do the same thing to both sides: Simple equations

Thinking about how to solve for an unknown mystery mass

Example 2: Completing the square

U10_L1_T2_we2 Completing the Square 2

Introduction to vertical angles

Figuring out angles at the intersection of two lines

Khan Academy
Angles
479
07:18

Example 3: Completing the square

U10_L1_T2_we3 Completing the Square 3